Pressure-roller for saw-mills



(Model.)

0. E. LEWIS.

PRESSURE ROLLER FOR SAW MILLS.

No. 250,928. Patented Dec. 13,1881.

INVENTOR WITNESSES:

oQw/z %Zm%f BY 2:

ATTORNEYS.

N PETERS. Fholo-Lflimgnphnr. Washmglun. D. c.

UNITED STATES PATENT OFFICE.

'GHARLES E. LEWVIS, OF BAY CITY, MICHIGAN.

PRESSURE-ROLLER FOR SAW-MILLS.

SPECIFICATION forming part of Letters Patent No. 250,928, dated December 13, 1881'.

Application filed June 21, 1881. (ModeL) To all whom t't may concern Be it known that I, CHARLES ENos LEWIS, of Bay City, in the county of Bay and State of Michigan, have invented a new and useful Improvement in Pressure-Rollers for Gang- Saw Mills, of which the following is a specification.

Figure 1 is a front elevation of my improvement. Fig. 2 is a front elevation of the shaft. Fig. 3 is an end view of the shaft. Fig. 4 is an end elevation of the pressure-rollers and their supporting cross-head.

Similar letters 6f reference indicate corresponding parts.

The object ofthis invention is to secure equal pressure upon logs passing through gang-saw mills at the same time, whether the said logs be of equal or unequal thickness.

The invention consists in pressure-rollers for gang-saw mills constructed with a cross-head having downwardly projecting arms, a doublecrank shaft pivoted to the arms of the crosshead, and the rollers placed upon the cranks, whereby the said rollers can adjust themselves to bear equally upon the logs, whether the said logs be equal or unequal in thickness; and also in the double-crank shaft that carries the rollers, constructed with a central journal, whereby the adjacent ends of the rollers can be brought close together, as will be hereinafter fully described.

A represents the bars to which the lower pressure-roller, B, is pivoted. O is the crosshead, that carries the upper pressure-rollers, D, and to which is attached the rod D, by which pressure is applied from a steam-cylinder or by other suitable means. Upon the lower side of the cross-headQ are formed three arms, E, to the lower ends ofwvhich is pivoted the shaft F. Upon the shaft F are formed two cranks, G, to receive the rollers D. The cranks G project in opposite directions, as shown in Fig. 2. The ends or journals of the crank-shaft F work in 1 slotsin the ends ofthe end arms, E. The middle part or journal K of the crank-shaft F is made large, and works in a recess in the lower end of the center arm, E, where it is kept in place upon disks or heads I, to which the outer ends of the cranks G are secured by pins J, or other suitable means, so that the said cranks can be detached to allow the rollers D to be placed upon and removed from the said cranks G. With this construction the rollers D will adjust themselves to press equally upon the logs passing through the mill, whether the said logs be equal or unequal in thickness.

Having thus fully described my invention,

I claim as new and desire to secure by Letters Patent 1. Pressure-rollers for gang-saw mills, constructed substantially as herein shown and described, consisting of the cross-head O, the doublecrank shaft F, and the rollers D mounted on said shaft, as set forth.

2. In pressure-rollers for gang-saw mills, the combination, with the cross-head O, having down Wardly-proj ecting arms E, ofthe shaft F, having cranks G projecting in opposite directions, and the rollers D mounted on said shaft, substantially as herein shown and described, whereby the said rollers can adjust themselves to apply equal pressure to logs of the same or difierent thickness, as set forth.

. 3. In pressure-rollers for gang-saw mills, the double-crank shaft F, constructed with a central journal, K, substantially as herein' shown and described, whereby'the adjacent ends of the rollers can be brought close t0- gether, as set forth.

CHARLES ENOS LEWIS.

Witnesses:

JOHN DRAKE, F. L. WANDS. 

